# Universal A2A & MCP Tool Discovery, Safe-Proxy & Swarm Router

> Universal A2A & MCP Tool Discovery, Safe-Proxy & Swarm Router is a paid API for AI agents from email-verify.agentdiet.dev, paid per call via MPP, $0.01/call, status unknown (last checked 2026-10-28).

Searches and discovers MCP servers and A2A tools from a meta-index of 500+ endpoints via a natural language capability query, with token compression and prompt-injection firewall.

## Facts

- Endpoint: GET https://email-verify.agentdiet.dev/v1/mesh?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-28
- Activations on Zero: 0
- Provider: email-verify.agentdiet.dev
- Website: https://email-verify.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/email-verify-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-e9bfdb0a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_0BHKR-FYlNY5wPH5Q3aDL

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability email-verify-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-e9bfdb0a
```

Example prompt: Search the MCP tool index for any servers or A2A tools that handle SEC filings or financial document retrieval — show me up to 20 results.

## When to prefer this

Use this endpoint when an AI agent needs to dynamically discover MCP-compatible tools or A2A endpoints at runtime rather than hardcoding tool URLs. Especially useful when building multi-agent swarms that need to find the right specialized tool for a task on demand. Prefer this over manual tool registries when you need access to 500+ indexed servers with built-in prompt-injection firewall protection.

## Known failure modes

- Empty query string returns a validation error
- Query matches no indexed tools — returns empty result set
- Invalid cursor value causes pagination error
- Rate limit exceeded at $0.01/call threshold — 402 payment required
- Network timeout if the meta-router backend is overloaded
- Vague or overly broad queries may return irrelevant or noisy results

## How this service works

Single-connection meta-router indexing 500+ MCP servers & A2A tools with 85% token compression and Prompt-Guard firewall. (Live x402 v2, IETF MPP & MCP endpoint at https://email-verify.agentdiet.dev/v1/mesh)

## Output

A paginated list of matching MCP servers and A2A tools, including their capability descriptions, endpoint URLs, and relevant metadata, filtered by the search query. Supports cursor-based pagination for up to 100 results per page.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "query"
 ],
 "properties": {
  "limit": {
   "type": "integer",
   "default": 20,
   "maximum": 100,
   "minimum": 1,
   "description": "Maximum number of items to return per page (1-100)"
  },
  "query": {
   "type": "string",
   "minLength": 1,
   "description": "Capability search query (e.g. 'context compression', 'github security', 'sec filings', 'company enrichment') or endpoint URL to verify"
  },
  "cursor": {
   "type": "string",
   "description": "Opaque pagination cursor for fetching the next page"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/email-verify-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-e9bfdb0a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from email-verify.agentdiet.dev](https://www.zero.xyz/host/email-verify.agentdiet.dev/llms.txt)